Empire all the way. but a fact to consider is time. the empire is only 50 years away from a 18 centry technolgy base. when they go all musket the brets are doomed.
plate main cant stop bullets and judgeing by there inventness they need to worry about things like Gatling guns (hand cracked machine guns) and Puckle guns (gaint 37mm 11 shot revolvers) in the face of this kind of techonlgy the bretons are doomed, the only question is what will the provence be called.
note: if you see me giving tactical advice: just assume i have a internet tab open to 1d4 chan and I'm summarizing off of that.
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